根据短文内容，填写所缺单词或用所给单词的正确形式填空。
Once upon a time, a lion 1. (catch) a mouse. The mouse said, “Please don’t eat me! I 2. (help) you one day.” The lion laughed but let the mouse go. Later, some hunters caught the lion 3. a net. The lion could not get 4. . He felt very sad. Then, the little mouse came. He bit through the net with his sharp 5. (tooth). The lion 6. (be) free! He thanked the little mouse. 7. the mouse said, “You laughed at me before, 8. even a small mouse can help a big lion.” This story 9. (teach) us that we should be kind to everyone, because even 10. (weak) ones can help the strongest sometimes.

1. caught
2. will help
3. with
4. out
5. teeth
6. was
7. And
8. but
9. teaches
10. the weakest

1. 由时间状语Once upon a time（从前）可知句子时态为一般过去时，catch的过去式为caught。
2. 此处是老鼠的直接引语，one day指代将来的某一天，句子用一般将来时will help，符合“总有一天我会帮到你”的语境。
3. 介词with可表示“使用（工具）”，此处指猎人们用网抓住了狮子。
4. 固定搭配get out表示“逃脱、脱身”，此处指被困在网里的狮子没法从网里出来。
5. 老鼠咬网用到的牙齿不止一颗，tooth的复数特殊变化形式为teeth。
6. 故事整体背景为过去，主语the lion是单数，对应的be动词过去式用was。
7. 前文提到狮子向老鼠道谢，此处顺承语境引出老鼠的发言，填并列连词And，句首首字母大写。
8. 此处语义表转折：“你之前嘲笑我，但是就算是一只小老鼠也能帮助大狮子”，填转折连词but。
9. 此处陈述客观道理，用一般现在时，主语This story是第三人称单数，teach的第三人称单数形式为teaches。
10. 后文的the strongest是形容词最高级，此处对应表达“最弱小的”，用weak的最高级the weakest，和后文的the strongest形成对应。